Reporting on TPC QC for LHC22a¶

PilotBeam data from May 2022
Link to JIRA: https://alice.its.cern.ch/jira/browse/O2-3035
B = 0.5 T
beam = pp
energy (sqrt) = 900 GeV
Software version: O2PDPSuite::nightly-20220622-1, jq::v1.6-3
Issues in FT0

Run lists¶

517616: 1656724288512 - 02 Jul 2022 01:11 UTC - 02 Jul 2022 03:11 CEST
517618: 1656711195961 - 01 Jul 2022 21:33 UTC - 01 Jul 2022 23:33 CEST
517619: 1656870807108 - 03 Jul 2022 17:53 UTC - 03 Jul 2022 19:53 CEST
517620: 1656695731655 - 01 Jul 2022 17:15 UTC - 01 Jul 2022 19:15 CEST
517623: 1656695733057 - 01 Jul 2022 17:15 UTC - 01 Jul 2022 19:15 CEST
517677: 1656699832878 - 01 Jul 2022 18:23 UTC - 01 Jul 2022 20:23 CEST
517678: 1656695746319 - 01 Jul 2022 17:15 UTC - 01 Jul 2022 19:15 CEST
517679: 1656870042271 - 03 Jul 2022 17:40 UTC - 03 Jul 2022 19:40 CEST
517684: 1656695744523 - 01 Jul 2022 17:15 UTC - 01 Jul 2022 19:15 CEST
571685: 1656695748869 - 01 Jul 2022 17:15 UTC - 01 Jul 2022 19:15 CEST
517689: 1656870074165 - 03 Jul 2022 17:41 UTC - 03 Jul 2022 19:41 CEST
517690: 1656695737619 - 01 Jul 2022 17:15 UTC - 01 Jul 2022 19:15 CEST
517692: 1656695752300 - 01 Jul 2022 17:15 UTC - 01 Jul 2022 19:15 CEST
517693: 1656695752367 - 01 Jul 2022 17:15 UTC - 01 Jul 2022 19:15 CEST
517737: 1656695742026 - 01 Jul 2022 17:15 UTC - 01 Jul 2022 19:15 CEST
517748: 1656695735131 - 01 Jul 2022 17:15 UTC - 01 Jul 2022 19:15 CEST
517750: 1656695758958 - 01 Jul 2022 17:15 UTC - 01 Jul 2022 19:15 CEST
517751: 1656695740371 - 01 Jul 2022 17:15 UTC - 01 Jul 2022 19:15 CEST
517753: 1656694219142 - 01 Jul 2022 16:50 UTC - 01 Jul 2022 18:50 CEST
517758: 1656869840772 - 03 Jul 2022 17:37 UTC - 03 Jul 2022 19:37 CEST
517767: 1656700155260 - 01 Jul 2022 18:29 UTC - 01 Jul 2022 20:29 CEST

General comments¶

Potential problems observed in runs 517753 & 517758
- Higher average momentum => Enhanced high momentum tail in pt distribution
- Lower number of clusters per track => Looking at the NclustersBeforeCuts it can be seen that tracks with NClusters<60 are much more common
- Ratio of positive/negative tracks is also different from norm in run 517758

Clusters¶

Variables:

N Clusters: c_N_Clusters;1
Q Max: c_Q_Max;1
Q Tot: c_Q_Tot;1
Sigma Time c_Sigma_Time;1
Sigma Pad c_Sigma_Pad;1
Time Bin c_Time_Bin;1

NClusters (shown is Run 517616)¶

Increased noise on OROC3 of C4 and A10.
Expected to be related to the powering of the field cage.

QTot (shown is Run 517616)¶

Reduced signal on OROC3 of C4 and A10.
Expected to be related to the powering of the field cage.

Sigma Time (shown is Run 517616)¶

Increased noise on OROC3 of C4 and A10.
Expected to be related to the powering of the field cage.

Tracks¶

Observables:

h2DQOverPtPhiCside;1 Charger over p_T vs. phi, C side
hPhiAsideNeg;1 Azimuthal angle, A side, neg. tracks
hPhiCsidePos;1 Azimuthal angle, C side, pos. tracks
hPhiCsideNeg;1 Azimuthal angle, C side, neg. tracks
h2DNClustersEta;1 Number of clusters vs. eta
hEtaRatio;1 Pseudorapidity, ratio neg./pos.
hPhiBothSides;1 Azimuthal angle, both sides clusters
hPhiAside;1 Azimuthal angle, A side
hPhiAsideRatio;1 Azimuthal angle, A side, ratio neg./pos.
hPhiCside;1 Azimuthal angle, C side
h2DEtaPhi;1 Tracks in eta vs. phi
hEtaNeg;1 Pseudorapidity, neg. tracks
hNClustersAfterCuts;1 Number of clusters
hNClustersBeforeCuts;1 Number of clusters (before cuts)
hPhiCsideRatio;1 Azimuthal angle, C side, ratio neg./pos.
hEtaPos;1 Pseudorapidity, pos. tracks
hPtNeg;1 Transverse momentum, neg. tracks
hPtPos;1 Transverse momentum, pos. tracks
hEtaBeforeCuts;1 Pseudorapidity (before cuts)
hPtBeforeCuts;1 Transverse momentum (before cuts)
hPtRatio;1 Transverse momentum, ratio neg./pos.
hPt;1 Transverse momentum
hQOverPt;1 Charge over transverse momentum
h2DQOverPtPhiAside;1 Charger over p_T vs. phi, A side
h2DNClustersPhiAside;1 Number of clusters vs. phi, A side
hPhiAsidePos;1 Azimuthal angle, A side, pos. tracks
h2DEtaPhiBeforeCuts;1 Tracks in eta vs. phi (before cuts)
hEta;1 Pseudorapidity
h2DNClustersPhiCside;1 Number of clusters vs. phi, C side
h2DNClustersPt;1 Number of clusters vs. p_T
h2DEtaPhiNeg;1 Negative tracks in eta vs. phi
h2DEtaPhiPos;1 Positive tracks in eta vs. phi
h2DNClustersEtaBeforeCuts;1 NClusters vs. eta (before cuts)
hSign;1 Sign of electric charge
h2DNClustersPtBeforeCuts;1 NClusters vs. p_T (before cuts)

Pt distribution¶

Potential problems observed in runs 517753 & 517758
- Higher average momentum

Enhanced high momentum tail in pt distribution for the two problematic runs

Clusters per track¶

Potential problems observed in runs 517753 & 517758
- Lower average count of clusters per track

Shorter tracks more prevelant

Sign¶

Slight devation in mean track sign observed in runs 517684 & 517689 & 517758

PID¶

Observables:

hdEdxMaxMIPVsSecTPC;1 MIP Q{Max} TPC
hdEdxTotMIPVsSecTPC;1 MIP Q{Tot} TPC
hdEdxTotMIPVsNclTPC;1 MIP Q{Tot} TPC
hdEdxTotMIPVsSnpTPC;1 MIP Q{Tot} TPC
hdEdxMaxMIPVsTglTPC;1 MIP Q{Max} TPC
hdEdxTotMIPVsTglTPC;1 MIP Q{Tot} TPC
hdEdxMaxMIPTPC;1 MIP Q{Max} TPC
hdEdxTotMIPTPC;1 MIP Q{Tot} TPC
hNClsPID;1 Number of clusters (after cuts)
hdEdxTotVsP_NegTPC;1 Q{Tot} negative particles TPC
hdEdxMaxMIPVsNclTPC;1 MIP Q{Max} TPC
hdEdxMaxMIPVsSnpTPC;1 MIP Q{Max} TPC
hNClsSubPID;1 Number of clusters (after cuts)
hdEdxVsPhiMipsAside;1 dEdx (a.u.) vs #phi (rad) of MIPs (A side)
hdEdxVsTgl;1 dEdx (a.u.) vs tan#lambda
hdEdxVsncls;1 dEdx (a.u.) vs ncls
hdEdxVsPhi;1 dEdx (a.u.) vs #phi (rad)
hdEdxMaxVsPTPC;1 Q{Max} TPC
hdEdxTotVspBeforeCuts;1 dEdx (a.u.) vs p (GeV/#it{c}) (before cuts)
hdEdxVsPhiMipsCside;1 dEdx (a.u.) vs #phi (rad) of MIPs (C side)
hMIPNclVsTglSub_TPC;1 rec. + sub-thrs. clusters TPC
hMIPNclVsTgl_TPC;1 rec. clusters TPC
hdEdxTotVsP_PosTPC;1 Q{Tot} positive particles TPC
hdEdxMaxVspBeforeCuts;1 dEdx_Max (a.u.) vs p (GeV/#it{c}) (before cuts)
hdEdxTotVsPTPC;1 Q{Tot} TPC

MIP signal¶

No major outliers observed
- All GOOD

dEdx vs P¶

No unexpected shapes observed
All GOOD

['GOOD', 'GOOD', 'GOOD', 'GOOD', 'GOOD', 'GOOD', 'GOOD', 'GOOD', 'GOOD', 'GOOD', 'GOOD', 'GOOD', 'GOOD', 'GOOD', 'GOOD', 'GOOD', 'GOOD', 'GOOD', 'GOOD', 'GOOD', 'GOOD']